265) The atomic mass of nitrogen is __________ oxygen.

266) One kg of sulphur requires 1 kg of oxygen for complete combustion and produces 2 kg of sulphur dioxide.

267) The change of entropy, when heat is absorbed by the gas, is

268) A machine which violates the first law of thermodynamics is known as perpetual motion machine of the second kind.

269) Both the Ericsson and Joule's cycle have two constant pressure processes.